[Enhancement] Insufficient gas error message for non-native tokens

### What is this about?

When trying to swap in the send flow, its a unclear how much gas I have available when encountering this low-gas error message. The only balance that is displayed on the screen is the balance for the send asset that has been selected.

### Scenario

_No response_

### Design

_No response_

### Technical Details

_No response_

### Threat Modeling Framework

_No response_

### Acceptance Criteria

_No response_

### Stakeholder review needed before the work gets merged

- [X] Engineering (needed in most cases)
- [X] Design
- [X] Product
- [ ] QA (automation tests are required to pass before merging PRs but not all changes are covered by automation tests - please review if QA is needed beyond automation tests)
- [ ] Security
- [ ] Legal
- [ ] Marketing
- [ ] Management (please specify)
- [ ] Other (please specify)

### References

_No response_

The issue identifies the send flow and includes a screenshot of the insufficient-gas error for non-native tokens, but names no files, tests, design, or acceptance criteria. Start by reproducing the low-gas state in the send flow and tracing where that message is produced; the work is done when users can understand their available native-token gas while sending another asset, with the expected wording and layout confirmed by design and product.

Written by the indexing model from the issue text.